#include <Windows.h>
#include <time.h>

void usleep(int waitTime)
{
	int ms = waitTime / 1000;
	Sleep(ms);
}

long long strtoll(const char *restrict str, char **restrict endptr, int base)
{
	return _strtoi64(str,endptr,base);
}

long long atoll(const char *nptr)
{
	return _atoi64(nptr);
}

#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
#define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
#else
#define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
#endif

struct timezone
{
	int  tz_minuteswest; /* minutes W of Greenwich */
	int  tz_dsttime;     /* type of dst correction */
};


int gettimeofday(struct timeval *tv, struct timezone *tz)
{
	// Define a structure to receive the current Windows filetime
	FILETIME ft;

	// Initialize the present time to 0 and the timezone to UTC
	unsigned __int64 tmpres = 0;
	static int tzflag = 0;

	if (NULL != tv)
	{
		GetSystemTimeAsFileTime(&ft);

		// The GetSystemTimeAsFileTime returns the number of 100 nanosecond 
		// intervals since Jan 1, 1601 in a structure. Copy the high bits to 
		// the 64 bit tmpres, shift it left by 32 then or in the low 32 bits.
		tmpres |= ft.dwHighDateTime;
		tmpres <<= 32;
		tmpres |= ft.dwLowDateTime;

		// Convert to microseconds by dividing by 10
		tmpres /= 10;

		// The Unix epoch starts on Jan 1 1970.  Need to subtract the difference 
		// in seconds from Jan 1 1601.
		tmpres -= DELTA_EPOCH_IN_MICROSECS;

		// Finally change microseconds to seconds and place in the seconds value. 
		// The modulus picks up the microseconds.
		tv->tv_sec = (long)(tmpres / 1000000UL);
		tv->tv_usec = (long)(tmpres % 1000000UL);
	}

	if (NULL != tz)
	{
		if (!tzflag)
		{
			_tzset();
			tzflag++;
		}

		// Adjust for the timezone west of Greenwich
		tz->tz_minuteswest = _timezone / 60;
		tz->tz_dsttime = _daylight;
	}

	return 0;
}